汽车用铝合金压铸件的慢压射工艺参数研究

采用光学显微镜、X射线探伤、模流分析等手段,结合正交试验和力学性能检测,研究慢压射工艺对YZAlSi9Cu3发动机气缸体压铸件组织和力学性能的影响。结果表明,发动机气缸体加工面气孔主要由慢压射工艺设计不合理导致,慢压射速度大于0.4m/s时,铸件卷气量较大,Al液包裹冲头油燃烧产生胶状物较多,铸件综合性能下降;慢压射速度设为0.2m/s时,铸件组织致密,含渣量较少,气孔率低,力学性能较好。

Slow Shot Parameters of Aluminum Alloy Die Castings for Automobiles

The effects of low-speed process on the porosity,microstructure and mechanical properties of YZAlSi9 Cu3 die-casting parts were investigated by means of optical microscopy,X-ray inspection and mold flow analysis,etc,combined with orthogonal test and mechanical testing.The experimental results show that the air hole in the machining surface of an engine cylinder block is mainly caused by the unreasonable design of the low speed process.When the slow injection speed is more than 0.4 m/s,the entrapped-gas volume of the castings is increased,and the liquid of the piston is more than the piston oil,so comprehensive performance is decreased.When the slow injection low speed is 0.2 m/s,the casting structure presents sound with a little slag content and low porosing,so the mechanical properties are desirable.